Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
427 PM EDT Sat Oct 05 2019

Valid 00Z Sun Oct 06 2019 - 00Z Wed Oct 09 2019

Days 1-2...

The probability of receiving at least 4-inches of snow and/or
0.25-inch of ice below 7500 feet is less than 10 percent.

Day 3...

...Pacific and Northern Rockies...

Strong onshore flow and cold air advection associated with an
amplifying shortwave trough are expected to bring snows to the
Olympics and northern Cascades on Tuesday.  Snow levels are
forecast to drop to around 3500-4500 feet, with some significant
accumulations possible for areas above 8000 ft in the northern
Cascades.

To the east, increasing upslope flow along with rapidly falling
temperatures associated with a strong cold front will support an
increasing potential for heavy snow across the Rockies of
northwestern Montana - especially within the northern portions of
Glacier National Park, where there is a high risk of accumulations
of 8-inches or more by Tuesday evening.

Pereira